Design method of microstructure device for generating rotational symmetric polarized light

The invention discloses a design method for a microstructure device for generating rotational symmetric polarized light, and belongs to the technical field of optics. The method is used for the design of a trench structure of the microstructure device. The method comprises the steps: 1, calculating a final etching depth h of the trench structure; 2, calculating the overall shape of a trench, wherein the preset parameters are as follows: the wavelength lambda of a light source, the refractive index ns of the material of the microstructure device, a filling factor a/d, an etching depth initial value h0, a periodic width d, a radius R, and the number of trenches n, and the radius R is the distance from a point at the part with the biggest periphery on the device body to the center of the device body; 3, forming the microstructure device according to steps 1 and 2. The method is simple in design, is high in precision, and is high in polarization quality of obtained polarized beams. 种用于产生旋转对称偏振光的微结构器件的设计方法，属于光学技术领